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Windows 7: 3.25G usable out of 4G RAM win7 64-bit

21 May 2011   #1
F0ICE

Windows 7 Home Premium 64-bit
 
 
3.25G usable out of 4G RAM win7 64-bit

i am running windows 7 Home premium 64-bit and recently upgraded my RAM from 3GB to 4GB. win7 reports only 3.25 being usable.
  • i have a dedicated video card an my onboard one is definitely disabled.
  • my BIOS reports 4096MB RAM detected.
  • max memory and CPU are unchecked in msconfig.
from looking at the resource monitor i see that 770MB of RAM is labeled as hardware reserved memory.

also i don't know if my BIOS supports a memory remap feature or not but even if it does its a locked HP BIOS so most setting are inaccessible.

is there any way to get my full memory? or does anyone know why this is happening on a 64-bit os?

Thanks in Advance.


My System SpecsSystem Spec
21 May 2011   #2
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

F0ICE, welcome to the Seven Forums.

Quote:
i don't know if my BIOS supports a memory remap feature or not but even if it does its a locked HP BIOS so most setting are inaccessible.
While the re-map is definitely needed (on newer boards it is enabled by default and the option may not be available), no idea if that is one that HP would hide or not if available. Another thing to consider is if the motherboard/chipset itself supports more than 4 GB. This should help explain what I mean by that,

The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed

Quote:
Note When the physical RAM that is installed on a computer equals the address space that is supported by the chipset, the total system memory that is available to the operating system is always less than the physical RAM that is installed. For example, consider a computer that has an Intel 975X chipset that supports 8 GB of address space. If you install 8 GB of RAM, the system memory that is available to the operating system will be reduced by the PCI configuration requirements. In this scenario, PCI configuration requirements reduce the memory that is available to the operating system by an amount that is between approximately 200 MB and approximately 1 GB. The reduction depends on the configuration.
Just change the mentioned 8 GB to 4 GB if your motherboard is one that only supports up to 4 GB, and the same applies.
My System SpecsSystem Spec
21 May 2011   #3
cyclic

Windows 7 home premium x64
 
 

Any 32 bit os can only map 4Gb of memory im total, so that includes motherboard and even hard drive requirements, but more importantly the memory on your graphics card, so if you have a 512Mb card Windows 32 bit will map that out of the total 'seen' memory of 4gb immediately leaving you with only 3.5 Gb avialable. Add up all the other mapped requirements and 3.25Gig is just about average. Which is more than enough for any application thusfore built (even 64 bit actually, but that's a whole other question).
My System SpecsSystem Spec
21 May 2011   #4
F0ICE

Windows 7 Home Premium 64-bit
 
 

Quote:
Note When the physical RAM that is installed on a computer equals the address space that is supported by the chipset, the total system memory that is available to the operating system is always less than the physical RAM that is installed. For example, consider a computer that has an Intel 975X chipset that supports 8 GB of address space. If you install 8 GB of RAM, the system memory that is available to the operating system will be reduced by the PCI configuration requirements. In this scenario, PCI configuration requirements reduce the memory that is available to the operating system by an amount that is between approximately 200 MB and approximately 1 GB. The reduction depends on the configuration.
so since i hit my motherboard's memory threshold it reserved the missing 0.75GB of ram for PCI devices. and the memory remapping feature that i either don't have or can't get to would bypass that allowing me full memory access. this would also explain why SIW reports so many memory address ranges assigned to the system board. am i right? either way i need to find a new motherboard if i want the rest of my memory.
thank you very much for explaining that. it helps to know why this is happening even though i can't fix it.
again thank you for your time.
My System SpecsSystem Spec
21 May 2011   #5
dsperber

Windows 7 Pro x64 (1), Win7 Pro X64 (2)
 
 

What shows in your Task Manager>

Run TASKMGR -> Performance tab, push Resource Monitor button -> select Memory tab.

For example, on my 4GB 64-bit Win7 Pro system (ASUS P5Q3 board, P45 chipset, Intel Duo E8400 CPU, 2x2GB DDR3 memory, ATI HD4670 512MB GDDR3 video card:




Note that my ATI HD4670 512MB video card apparently does not take any memory from my 4GB physical memory, which is all available to Win7. RMB on Computer -> Properties shows my full 4GB installed, there is no second qualifying line showing "available... " (something less). And Resource Monitor also confirms that all 4GB is available for use by Win7 and programs.

I have a similar story on my other machine, with a 1GB ATI HD4850 card. Again, all 4GB is available. Nothing's been carved out for hardware use.
My System SpecsSystem Spec
21 May 2011   #6
F0ICE

Windows 7 Home Premium 64-bit
 
 



as you can see 770MB is marked as hardware reserved here is SIW's listing of memory ranges.


is it normal for that many system board instances?
My System SpecsSystem Spec
21 May 2011   #7
dsperber

Windows 7 Pro x64 (1), Win7 Pro X64 (2)
 
 

Quote   Quote: Originally Posted by F0ICE View Post


as you can see 770MB is marked as hardware reserved
I do indeed.

You haven't provided specifics on your hardware setup. Easiest way is to give us three screenshots from CPU-Z, of the CPU, MAINBOARD and GRAPHICS tabs. I'm guessing this is an HP Pavillion laptop, but I don't think you've provided model details.

Knowing the details of your motherboard, chipset, CPU and video hardware as presented by CPU-Z is very useful. But if 770MB is reserved for hardware use (specifically, the video hardware), seems to me that there is nothing that can be done other than change the fundamental hardware (i.e. upgrade to a new video card if possible, which seems unlikely on a laptop).

But let's reserve judgment until we see your hardware details.
My System SpecsSystem Spec
21 May 2011   #8
GeneO

Windows 7 64 bit SP1. EFI boot partition, full EFI boot.
 
 

If you cannot remap the memory, it looks like you are stuck. Your memory map is typical for this situation. Knowing the model of your computer will help us look up the chipset and motherboard fill in your system spec. But I expect there is nothing you can do.
My System SpecsSystem Spec
21 May 2011   #9
F0ICE

Windows 7 Home Premium 64-bit
 
 

nope not a laptop. hp pavilion a1250n

motherboard: ms-7184/Amethystm using radeon xpress 200 chipset
CPU: amd athlon x2 3800+ @ 2.0GHz Toledo Socket 939
GPU radeon hd 4350 from gigabyte 512M VRAM PCIE x16
memoryDR PC3200 4x1GB Dual Channel

thats all i can provide right now.
the motherboard and CPU are original to the PC. the motherboard does have an onboard video adapter which is disabled via BIOS.
i have to get back to you on CPUZ but i can say this right now, when i was using 3GB of RAM that hardware reserved memory reading was around 2MB.

i will post CPUZ details tomorrow. thanks for the help.
My System SpecsSystem Spec
21 May 2011   #10
zigzag3143

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by cyclic View Post
Any 32 bit os can only map 4Gb of memory im total, so that includes motherboard and even hard drive requirements, but more importantly the memory on your graphics card, so if you have a 512Mb card Windows 32 bit will map that out of the total 'seen' memory of 4gb immediately leaving you with only 3.5 Gb avialable. Add up all the other mapped requirements and 3.25Gig is just about average. Which is more than enough for any application thusfore built (even 64 bit actually, but that's a whole other question).

Um he is running 64 bit
My System SpecsSystem Spec
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 3.25G usable out of 4G RAM win7 64-bit




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